"The doctor told me he saw nothing serious," said Sanchez, who was examined by team orthopedist Ken Akizuki. Sanchez will undergo a MRI on Wednesday morning to determine the extent of the injury.

Manager Bruce Bochy said that he believes Sanchez could be sidelined for nothing more than "a couple of days." Bochy added that the organization did not immediately summon a catcher from the Minor Leagues to be on hand Wednesday in case Sanchez's injury is worse than believed. And Buster Posey said that he can handle catching Thursday afternoon's series finale following Wednesday night's game. Until Sanchez is cleared to play, Pablo Sandoval will serve as San Francisco's emergency catcher.

After singling to right field with nobody out and Angel Pagan on first base in the fourth inning, Sanchez hurt himself as he returned to the base when Braves pitcher Jair Jurrjens lobbed a pickoff throw. Sanchez tried running after time was called to test his leg, but left the game in obvious discomfort.

"It hurt so bad," he said. "When I tried to run, I couldn't."

Sanchez admitted that he initially felt discomfort in the knee last weekend.

"But it wasn't too bad," he said. "It was a little bit sore."

Sanchez is batting .281 in 39 games, including 30 starts, with two home runs and 24 RBIs.